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diff --git a/layout/mathml/tests/test_bug827713.html b/layout/mathml/tests/test_bug827713.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=706406
+-->
+<head>
+  <title>Test for Bug 706406</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=827713">Mozilla Bug 827713</a>
+<p id="display"></p>
+  <p><math>
+    <msub subscriptshift="50px">
+      <mspace width="50px" height="25px" depth="25px" mathbackground="blue" id ="subbase"></mspace>
+      <mspace width="50px" height="25px" depth="25px" mathbackground="red" id="subsub"></mspace>
+    </msub>
+  </math></p>
+
+  <p><math>
+    <msup superscriptshift="50px">
+      <mspace width="50px" height="25px" depth="25px" mathbackground="blue" id="supbase"></mspace>
+      <mspace width="50px" height="25px" depth="25px" mathbackground="green" id="supsup"></mspace>
+    </msup>
+  </math></p>
+
+  <p><math>
+    <msubsup subscriptshift="50px" superscriptshift="50px">
+      <mspace width="50px" height="25px" depth="25px" mathbackground="blue" id="ssbase"></mspace>
+      <mspace width="50px" height="25px" depth="25px" mathbackground="red" id="sssub"></mspace>
+      <mspace width="50px" height="25px" depth="25px" mathbackground="green" id="sssup"></mspace>
+    </msubsup>
+  </math></p>
+<pre id="test">
+<script type="application/javascript">
+
+    /** Test for the scriptshift aspect of bug 827713 **/
+    SimpleTest.waitForExplicitFinish();
+
+    subBaseRect = $("subbase").getBoundingClientRect();
+    subSubRect = $("subsub").getBoundingClientRect();
+    is(subBaseRect.bottom, subSubRect.top, "Bad subscript shift for msub");
+
+    supBaseRect = $("supbase").getBoundingClientRect();
+    supSupRect = $("supsup").getBoundingClientRect();
+    is(supBaseRect.top, supSupRect.bottom, "Bad superscript shift for msup");
+
+    ssBaseRect = $("ssbase").getBoundingClientRect();
+    ssSubRect = $("sssub").getBoundingClientRect();
+    ssSupRect = $("sssup").getBoundingClientRect();
+    is(ssBaseRect.bottom, ssSubRect.top, "Bad subscript shift for msubusp");
+    is(ssBaseRect.top, ssSupRect.bottom, "Bad superscript shift for msubusp");
+
+
+    SimpleTest.finish();
+
+</script>
+</pre>
+</body>
+</html>